.x-form-file-wrap {
    position: relative;
    height: 22px;
}
.x-form-file-wrap .x-form-file {
  position: absolute;
  right: 0;
  -moz-opacity: 0;
  filter:alpha(opacity: 0);
  opacity: 0;
  z-index: 2;
    height: 22px;
}
.x-form-file-wrap .x-form-file-btn {
  position: absolute;
  right: 0;
  z-index: 1;
}
.x-form-file-wrap .x-form-file-text {
    position: absolute;
    left: 0;
    z-index: 3;
    color: #777;
}